USDA Natural ResourceS Conservation Service
Conservation Practice Specification
ARIZONA
channel stabilization
(feet)
CODE NO. 584
NRCS Field Office Technical Guide, Section IV Page 2 of 2 NRCS, Arizona
July, 1980
584 – Channel Stabilization
Specification
NRCS Field Office Technical Guide, Section IV Page 2 of 2 NRCS, Arizona
July, 1980
584 – Channel Stabilization
Specification
- scope
The work shall consist of all preparation, excavation, clearing, and furnishing and installing materials as required to construct the stabilization measure.
- general requirements
Measures and installation methods that enhance fish and wildlife values shall be incorporated as needed and practical. Special attention shall be given to protecting and maintaining key shade, food and den trees and to stabilizing disturbed areas.
Trees and brush shall be removed in a manner that prevents damage to other trees and property.
Trees, brush and other materials shall be disposed of in a manner that ensures the least detrimental effect on the environment.
Construction operations shall be carried out in a manner that minimizes erosion and pollution and holds these concerns within legal limits.
(1) Specific Criteria for Spider Jacks
a. Materials
Wood Jack Legs and Anchors shall be the diameter shown on the drawings and reasonably straight sections from trees found in the local area and approved by the engineer.
Wire Shall be 9 gage medium temper galvanized zinc coated steel wire as specified in ASTM-!-641. Wire shall have Class 3 zinc coating as specified in ASTM-A-641.
Cable shall be new galvanized cable or good condition used cable of type, quality and size shown on the drawings. The engineer shall approve all used cable.
Rope clips and thimbles shall be galvanized steel.
Concrete anchors shall be constructed with Type II or Type V cement, contain a minimum of 6 bags of cement per cubic yard of concrete, water-cement ratio of 0.5 or less, and a ¾” maximum nominal size of coarse aggregate. Mixes that include fly ash shall be based on absolute volume with a maximum substitution of 10%. Fly ash shall be Class F. The source of the fly ash shall be identified by the contractor and approved by the engineer.
b. Reinforcement
Before reinforcement is placed, the surfaces of the bars and metal supports shall be cleaned to remove any loose mill scale, oil, grease, or foreign substances. Reinforcement shall be accurately placed and secured in position in a manner that will prevent its displacement during the placement of concrete.
c. Excavation
Trench excavation for anchor cable and anchor blocks shall be to the lines and grades shown on the drawings and as staked in the field. Trenches deeper than 5 feet shall be sloped on a 1-1 above the 5 foot level.
d. Backfill
The trench for anchor cable and anchor blocks shall be backfilled with suitable material obtained from the excavation. Fill shall be compacted to a minimum of 3 feet above the anchor cable and block. Moisture content of fill material shall be sufficient to obtain the required density. Fill shall be compacted to a density equivalent to that of the material in the trench side walls by means of hand tamping, manually directed power tampers, or plate vibrators. The remainder of the trench shall be backfilled with random backfill from the excavation, or from other sources approved by the engineer. Mounding shall be as required to approximate natural ground surface after settling.
e. Curing
Concrete anchors shall be moist cured or covered with a liquid during compound for 7 days before placement. Anchors shall be lifted and placed with slings.
f. Installation
Jacks, anchors and appurtenances shall be installed in a workmanlike manner to the lines and at the location shown on the drawings or staked in the field.
g. Vegetative plantings
Spider jack installations should always be supplemented with vegetation. A vegetative planting plan should be an integral part of the proposed spider jack job.
- Special Requirements
Installation shall be in accordance with the following drawings, specifications and special requirements. NO CHANGES ARE TO BE MADE IN THE DRAWINGS OR SPECIFICATIONS WITHOUT PRIOR APPROVAL OF NRCS.
Other Requirements
- Required Attachments
Plan Map showing location
Designs showing alignment, width, side slopes, drainage, erosion control, surfacing, traffic safety, and construction operations.
Drawings, No.
- Other Attachments
Associated Practice Specifications
Water Quality Considerations
Other
- Operation and Maintenance
This conservation practice is an asset to your farm or ranch. This practice will need periodic operation and maintenance to maintain satisfactory performance. The life of this practice or system is at least 10 years. The life of this practice can be assured or extended by thorough and timely operation and maintenance. Here are some recommendations to help you develop a good operation and maintenance program.
GENERAL RECOMMENDATIONS
Maintain the roadway surface in a good condition, which includes periodic grading or repair of the surface.
Prevent surface ponding by grading to remove depressions.
Limit livestock usage to periods that permit use without damage.
If fences are installed, they shall be maintained to provide warning and/or prevent unauthorized human or livestock entry.
Remove debris to prevent blockage of stream crossings, culverts or bridges.
Control all rodents or burrowing animals. Immediately repair any damage caused by their activity.
Immediately repair any damage from vandalism, vehicles, or livestock.
Specific Recommendations For Your Installation
NRCS Field Office Technical Guide, Section IV Page 2 of 2 NRCS, Arizona
July, 1980